The current version of the API does not support actions to be performed directly on the site but opens many possibilities to interact with user data off site and in desktop applications. At launch both commercial and noncommercial web applications are allowed to make up to 100,000 calls to the API in a 24 hour period.

The Facebook developers page highlights one application called Facebank that keeps track of debts and shared expenses among Facebook users. The Facebook Developers discussion board already has more than 500 members and we expect to start seeing Facebook mashups being developed quickly. A handful of projects based on the Facebook API have already been posted to the new Google Code depository.